DS1244Y-70 Ver la hoja de datos (PDF) - Unspecified
Número de pieza
componentes Descripción
Fabricante
DS1244Y-70 Datasheet PDF : 16 Pages
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DS1244/DS1244P
256k NV SRAM
with Phantom Clock
POWER-DOWN/POWER-UP TIMING
PARAMETER
at VIH before Power-Down
Vcc Slew from VPF(max) to
VPF(min)(
at VPF)
Vcc Slew from VPF(min) to VSO
Vcc Slew from VPF(max) to
VPF(min)(
at VPF)
at VIH before Power-Up
SYMBOL
tPD
tF
tFB
tR
tREC
PARAMETER
Expected Data Retention Time
SYMBOL
tDR
Over the operating range (5V)
MIN
TYP
MAX
UNITS
NOTES
0
µs
300
µs
10
µs
0
µs
1.5
2.5
ms
(TA=+25℃)
MIN
TYP
MAX
UNITS
NOTES
10
years
9
Warning: Under no circumstances are negative undershoots of any amplitude allowed when device is in battery-backup mode.
MEMORY AC ELECTRICAL CHARACTERISTICS
PARAMETER
Read Cycle Time
Access Time
to Output Vaild
to Output Valid
or
to Output Active
Output High-Z from Deselection
Output Hold from Address Change
Write Cycle Time
Write Pulse Width
Address Setup Time
Write Recovery Time
Output High-Z from
Output Active from
Data Setup Time
Data Hold Time from
SYMBOL
tRC
tACC
tOE
tCO
tCOE
tOD
tOH
tWC
tWP
tAW
tWR
tODW
tOEW
tDS
tDH
Over the Operating range (3.3V)
DS1244W-120
MIN
MAX
UNITS
120
ns
120
ns
60
ns
120
ns
5
ns
40
ns
5
ns
120
ns
90
ns
0
ns
20
ns
40
ns
5
ns
50
ns
20
ns
NOTES
5
5
3
10
5
5
4
4
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